Fail safe gas furnace optical flame sensor using a transconducta

Radiant energy – Photocells; circuits and apparatus – Flame light source

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431 79, G02B 2700

Patent

active

06060719&

ABSTRACT:
A fail safe gas furnace optical flame sensor uses a transconductance amplifier with low photodiode current to sense the presence or absence of a gas flame within the burner of a gas furnace. The photodiode signal appears as the only negative voltage signal in the circuit, and the equivalent resistance feedback network is redundantly designed, thus ensuring that no false flame-on conditions will be detected due to the failure of a single resistive component. Because it does not reside within the flame, the sensor is immune to false flame-off conditions caused by material deposition and corrosion of the sensor.

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